Hydrophobic and oleophobic coating composition

Patent metadata

Field	Value
Publication number	US-9382441-B2
Application number	US-201314411199-A
Country	US
Kind code	B2
Filing date	Jun 27, 2013
Priority date	Jun 29, 2012
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

The present disclosure provides a hydrophobic and oleophobic coating composition, which comprises the following components based on weight percentage: 0.1-15% of a fluorosiloxane, 1-30% of a polyacrylic resin, 0.1-15% of a silane coupler, 33-98% of an organic solvent, and 0.05-15% of an acid. By combining the polyacrylic resin and the fluorosiloxane which exhibits hydrophobic property, the present composition not only provides good hydrophobic property but also ensures durable hydrophobic property of the coating with the help of good adhesion of polyacrylic resin. The coating composition can form hard coating which has high glossiness and high transparency under relatively low temperatures and has a contact angle of 115-120°. This coating composition can be used on surfaces of substrates, such as automotive paints, metal, plastic and glass, and it can retain long lasting hydrophobic and oleophobic property even placed outdoors for several months, and it can also prevent the surface of the substrate from being scratched.

First claim

What is claimed is:

1. A coating composition, which comprises the following components based on weight percentage:
0.1-15% of a fluorosilane,
1-30% of a polyacrylic resin,
0.1-15% of a silane coupler,
0.05-15% of an acid,
33-98% of an organic solvent;

wherein the polyacrylic resin is in the form of hydroxy modified polyacrylic resin emulsion.

2. The coating composition according to claim 1 , characterized in that the fluorosilane is represented by the formula (I):
CF 3 (CF 2 ) a (CH 2 ) b —Si(OCH 2 CH 3 ) 3   (I)

wherein, a is 3-10, and b is 1-7.

3. The coating composition according to claim 1 , characterized in that the fluorosilane is perfluoro polyether siloxane.

4. The coating composition according to claim 3 , characterized in that the fluorosilane is perfluoro polyether siloxane represented by formula (II):
(C 2 H 5 O) 3 Si(C) 3 N(H(C(O)—R f —C)N(H)(CH 2 ) 3 Si(OC 2 H 5 ) 3   (II)

wherein R f is CF 2 O(CF 2 CF 2 O) n (CF 2 O) m CF 2 , n and m are independently 1-20.

5. The coating composition according to claim 4 , characterized in that n and m are independently 9-10.

6. The coating composition according to claim 1 , characterized in that the silane coupler is at least one selected from the group consisting of the following compounds:

7. The coating composition according to claim 6 , characterized in that the silane coupler is:

8. A coating composition, which comprises the following components based on weight percentage:
0.1-15% of a fluorosilane,
1-30% of a polyacrylic resin,
0.1-15% of a silane coupler,
0.05-15% of an acid,
33-98% of an organic solvent;

wherein the organic solvent is at least one selected from the group consisting of acetone and methyl ethyl ketone.

9. The coating composition according to claim 1 , characterized in that the acid is at least one selected from of the group consisting of hydrochloric acid, sulfuric acid, acetic acid, citric acid and lactic acid.

10. A method for preparing the coating composition according to claim 1 , comprising the following steps:
a) mixing the organic solvent, the polyacrylic resin, the silane coupler and the fluorosiloxane to yield a clear mixture;
b) adding the acid into the mixture, and stirring it until the mixture being clear; and
c) allowing the mixture obtained in step b) to stand for aging.

11. The method according to claim 10 , characterized in that in step b) the mixture is stirred for 1-3 hrs.

12. The method according to claim 10 , characterized in that in step c) the mixture is aged for at least 1 day.

13. A method for preparing the coating composition according to claim 1 , comprising: mixing the fluorosiloxane and acid to obtain a first mixture, and mixing the organic solvent, the polyacrylic resin and the silane coupler to obtain a second mixture, and then mixing the first mixture and the second mixture, followed by stirring and aging.

14. The method according to claim 13 , characterized in that the stirring takes 1-3 hrs.

15. The method according to claim 13 or 14 , characterized in that the aging takes at least 1 day.

Assignees

• 3M Innovative Properties Co

Inventors

• Liang Xinyu
• Hao Lifei
• Yang Yu
• Song Minhao
• Xia Kefeng

Classifications

• C08K5/09

  Carboxylic acids; Metal salts thereof; Anhydrides thereof · CPC title

• C09D133/02 Primary

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• C08K5/092

  Polycarboxylic acids · CPC title

• C09D133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08K3/16

  Halogen-containing compounds · CPC title